Vapour pressure isotope effects in liquid hydrogen chloride

J. N C Lopes, J. C G Calado, G. Jancsó

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The difference between the vapour pressures of HCl and DCl has been measured over the temperature range 170-203 K by a differential manometric technique in a precision cryostat. In this range the vapour pressure of HCl is higher than that of DCl by 3.2% at 170 K, decreasing to 0.9% at 200 K. The reduced partition function ratios fl/fg derived from the vapour pressure data can be described by the equation ln(fl/f g)=(3914.57+or-10)T2-(17.730+or-0.055)/T. The experimentally observed H-D vapour pressure isotope effect, together with the values on the 35Cl-37Cl isotope effect available in the literature, is interpreted in the light of the statistical theory of isotope effects in condensed systems by using spectroscopic data of the vapour and liquid phases. The results indicate that the rotation in liquid hydrogen chloride is hindered. Temperature-dependent force constants for the hindered translational and rotational motions were invoked in order to obtain better agreement between the model calculation and experiment.

Original languageEnglish
Article number004
Pages (from-to)6691-6702
Number of pages12
JournalJournal of Physics Condensed Matter
Volume4
Issue number32
DOIs
Publication statusPublished - 1992

Fingerprint

hydrogen chlorides
liquid hydrogen
Hydrochloric Acid
Vapor pressure
Isotopes
isotope effect
vapor pressure
Hydrogen
Liquids
Cryostats
translational motion
cryostats
partitions
liquid phases
Vapors
vapor phases
Temperature
temperature
Experiments

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Vapour pressure isotope effects in liquid hydrogen chloride. / Lopes, J. N C; Calado, J. C G; Jancsó, G.

In: Journal of Physics Condensed Matter, Vol. 4, No. 32, 004, 1992, p. 6691-6702.

Research output: Contribution to journalArticle

Lopes, J. N C ; Calado, J. C G ; Jancsó, G. / Vapour pressure isotope effects in liquid hydrogen chloride. In: Journal of Physics Condensed Matter. 1992 ; Vol. 4, No. 32. pp. 6691-6702.
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